<!-- Based on fast/repaint/fixed-descendant-of-transformed-scrolled.html -->
<!DOCTYPE html>
<script src="resources/paint-invalidation-test.js"></script>
<script>
window.expectedPaintInvalidationObjects = [
    "LayoutBlockFlow (positioned) DIV id='fixed'",
];
function paintInvalidationTest() {
  document.getElementById('fixed').style.backgroundColor = 'green';
}
onload = function() {
  document.getElementById('transformed').scrollTop = 50;
  runPaintInvalidationTest();
}
</script>
<style>
#transformed {
  position: absolute;
  top: 50px;
  left: 100px;
  transform: translateX(0);
  overflow: scroll;
  width: 300px;
  height: 300px;
}
#fixed {
  position: fixed;
  top: 150px;
  left: 100px;
  width: 100px;
  height: 100px;
  background-color: red;
}
#relative {
  position: relative;
  top: 50px;
  left: 50px;
}
/* to make the transformed container scrollable */
#content {
  width: 1000px;
  height: 1000px;
}
</style>
Tests invalidation of a fixed-position descendant of a transformed scrolled element.
Passes if there is a green box at the center of the scrollable area.
<div id="transformed">
  <div id="relative">
    <div id="fixed"></div>
    <div id="content"></div>
  </div>
</div>